Em's Server Utils provides an extensive API for managing and changing player usernames and visibility. It's used in a few of my other mods.
In addition, it provides the following commands:



This mod may be used in any modpack or as a dependency for any mod as long as it is distributed via CurseForge or Modrinth and links to the official project page. Redistribution of the jar file is not permitted.
Made w/ <3 by Emrillion